$17-4\left(-3+5\right)-\left(8+7\right)+3$
$2\left(\frac{1}{8}x+y\right)$
$-3x-2y^{15}$
$5a-7\cdot5a+7\left(b\right)$
$6x^3+13x^3$
$\:3\left(a\:-\:b\right)\:+\:2\left(c\:-\:a\right)$
$\left(y\right)^'=\frac{-\left(x^2+y^2\right)}{2xy}$
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